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| 1 // Copyright 2011 The Native Client SDK Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can | |
| 3 // be found in the LICENSE file. | |
| 4 | |
| 5 #include "debugger/rsp/rsp_packetizer.h" | |
| 6 | |
| 7 // Description of GDB RSP protocol: | |
| 8 // http://sources.redhat.com/gdb/current/onlinedocs/gdb.html#Remote-Protocol | |
| 9 | |
| 10 namespace { | |
| 11 const int kMaxCharValue = 126; | |
| 12 const int kEscapeXor = 0x20; | |
| 13 } // namespace | |
| 14 | |
| 15 namespace rsp { | |
| 16 | |
| 17 Packetizer::Packetizer() | |
| 18 : state_(IDLE), | |
| 19 consumer_(NULL), | |
| 20 calculated_checksum_(0), | |
| 21 recv_checksum_(0) { | |
| 22 Reset(); | |
| 23 } | |
| 24 | |
| 25 Packetizer::~Packetizer() { | |
| 26 } | |
| 27 | |
| 28 void Packetizer::SetPacketConsumer(PacketConsumer* consumer) { | |
| 29 consumer_ = consumer; | |
| 30 } | |
| 31 | |
| 32 void Packetizer::Reset() { | |
| 33 state_ = IDLE; | |
| 34 body_.Clear(); | |
| 35 calculated_checksum_ = 0; | |
| 36 recv_checksum_ = 0; | |
| 37 } | |
| 38 | |
| 39 bool Packetizer::IsIdle() const { | |
| 40 return (state_ == IDLE); | |
| 41 } | |
| 42 | |
| 43 void Packetizer::OnData(const debug::Blob& data) { | |
| 44 for (size_t i = 0; i < data.size(); i++) | |
| 45 OnChar(data[i]); | |
| 46 } | |
| 47 | |
| 48 void Packetizer::OnData(const char* data_str) { | |
| 49 OnData(data_str, strlen(data_str)); | |
| 50 } | |
| 51 | |
| 52 void Packetizer::OnData(const void* data, size_t data_length) { | |
| 53 const unsigned char* cdata = static_cast<const unsigned char*>(data); | |
| 54 if (NULL == data) | |
| 55 return; | |
| 56 for (size_t i = 0; i < data_length; i++) { | |
| 57 unsigned char c = *cdata++; | |
| 58 OnChar(c); | |
| 59 } | |
| 60 } | |
| 61 | |
| 62 void Packetizer::OnChar(unsigned char c) { | |
| 63 if (NULL == consumer_) | |
| 64 return; | |
| 65 | |
| 66 if (((BODY == state_) && ('#' != c)) || | |
| 67 (ESCAPE == state_) || (RUNLEN == state_)) | |
| 68 AddToChecksum(c); | |
| 69 | |
| 70 switch (state_) { | |
| 71 case IDLE: { | |
| 72 if (('+' == c) || ('-' == c)) | |
| 73 return; | |
| 74 if ('$' == c) | |
| 75 state_ = BODY; | |
| 76 else if (3 == c) // RSP is using Ctrl-C as a break message. | |
| 77 consumer_->OnBreak(); | |
| 78 else | |
| 79 consumer_->OnUnexpectedChar(c); | |
| 80 break; | |
| 81 } | |
| 82 case BODY: { | |
| 83 if ('}' == c) | |
| 84 state_ = ESCAPE; | |
| 85 else if ('#' == c) | |
| 86 state_ = END; | |
| 87 else if ('*' == c) | |
| 88 state_ = RUNLEN; | |
| 89 else if (c > kMaxCharValue) | |
| 90 consumer_->OnUnexpectedChar(c); | |
| 91 else | |
| 92 AddCharToBody(c); | |
| 93 break; | |
| 94 } | |
| 95 case ESCAPE: { | |
| 96 c = c ^ kEscapeXor; | |
| 97 AddCharToBody(c); | |
| 98 state_ = BODY; | |
| 99 break; | |
| 100 } | |
| 101 case RUNLEN: { | |
| 102 int n = c - 29; | |
| 103 AddRepeatedChars(n); | |
| 104 state_ = BODY; | |
| 105 break; | |
| 106 } | |
| 107 case END: { | |
| 108 if (HexCharToint(c, &recv_checksum_)) { | |
| 109 recv_checksum_ <<= 4; | |
| 110 state_ = CHECKSUM; | |
| 111 } | |
| 112 break; | |
| 113 } | |
| 114 case CHECKSUM: { | |
| 115 unsigned int digit = 0; | |
| 116 if (HexCharToint(c, &digit)) { | |
| 117 recv_checksum_ += digit; | |
| 118 bool checksum_valid = (recv_checksum_ == calculated_checksum_); | |
| 119 consumer_->OnPacket(body_, checksum_valid); | |
| 120 Reset(); | |
| 121 } | |
| 122 break; | |
| 123 } | |
| 124 } | |
| 125 } | |
| 126 | |
| 127 void Packetizer::AddToChecksum(unsigned char c) { | |
| 128 calculated_checksum_ += c; | |
| 129 calculated_checksum_ %= 256; | |
| 130 } | |
| 131 | |
| 132 void Packetizer::AddCharToBody(unsigned char c) { | |
| 133 body_.PushBack(c); | |
| 134 } | |
| 135 | |
| 136 void Packetizer::AddRepeatedChars(size_t n) { | |
| 137 size_t len = body_.size(); | |
| 138 if (0 != len) { | |
| 139 char c = body_[len - 1]; | |
| 140 for (size_t i = 0; i < n; i++) | |
| 141 AddCharToBody(c); | |
| 142 } | |
| 143 } | |
| 144 | |
| 145 bool Packetizer::HexCharToint(unsigned char c, unsigned int* result) { | |
| 146 if (('0' <= c) && ('9' >= c)) { | |
| 147 *result = c - '0'; | |
| 148 } else if (('A' <= c) && ('F' >= c)) { | |
| 149 *result = c - 'A' + 10; | |
| 150 } else if (('a' <= c) && ('f' >= c)) { | |
| 151 *result = c - 'a' + 10; | |
| 152 } else { | |
| 153 consumer_->OnUnexpectedChar(c); | |
| 154 return false; | |
| 155 } | |
| 156 return true; | |
| 157 } | |
| 158 | |
| 159 } // namespace rsp | |
| 160 | |
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Chromium Code Reviews
Issue 10928195:
First round of dead file removal (Closed)
Base URL: https://github.com/samclegg/nativeclient-sdk.git@master